<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>
    
</body>
<script>
    //100%
    var prefixesDivBy5 = function(A) {
        let res = [];
        A.reduce((acc, cur) => {
            acc = (acc*2 + cur)%5
            res.push(acc === 0);
            return acc;
        }, 0);
        return res;
    };
    let A = [1,0,1,0,0,0,0,0,0,0,0,1,1,1,0,0,1,0,1,1,1,1,1,1,0,0,0,1,0,1,1,1,1,0,1,1,0,1,0,1,0,0,0,1,0,0,0,0,0,1,0,0,1,1,0,0,1,1,1];
    console.log(prefixesDivBy5(A));
    
</script>
</html>